Topic
Detection limit
About: Detection limit is a research topic. Over the lifetime, 34379 publications have been published within this topic receiving 644817 citations. The topic is also known as: limit of detection & lower detection limit.
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TL;DR: A simple reversed-phase LC method capable of detecting ng/ml quantities of phenolic compounds in water is described and was applied to the analysis of phenols in wine and river water.
130 citations
TL;DR: By fabricating Fe2O3NPs/rGO/PEDOT modified FTO electrode for determining ACh level in serum samples, the applicability of biosensor has increased immensely as the detection of the level neurotransmitter is first priority for patients suffering from memory loss or Alzheimer's disease.
130 citations
TL;DR: The practical application of the proposed AuNPs-GO-IL-GCE sensor has been carried out and demonstrated as feasible for determination of trace levels of Hg(2+) in drinking and environmental water samples.
Abstract: A simple and sensitive electrochemical assay strategy of stripping voltammetry for mercury ions (Hg2+) detection is described based on the synergistic effect between ionic liquid functionalized graphene oxide (GO-IL) and gold nanoparticles (AuNPs). The AuNPs–GO-IL modified onto glassy carbon electrode (GCE) resulted in highly enhanced electron conductive nanostructured membrane and large electroactive surface area, which was excellently examined by scanning electron microscopy and cyclic voltammetry. After accumulating Hg2+, anodic stripping voltammetry (ASV) was performed, and differential pulse voltammetry (DPV) was employed for signal recording of Hg2+. Several main experimental parameters were optimized, i.e., deposition potential and time of AuNPs were −0.2 V and 180 s, respectively, and accumulation potential and time of Hg2+ were −0.3 V and 660 s, respectively. Under the optimal conditions, this AuNPs–GO-IL–GCE sensor attained a good linearity in a wide range of 0.1–100 nM (R = 0.9808) between the concentration of the Hg2+ standard and peak current. The limit of detection was estimated to be 0.03 nM at a signal-to-noise ratio of 3σ. A variety of common coexistent ions in water samples were investigated, showing no obvious interferences on the Hg2+ detection. The practical application of the proposed sensor has been carried out and demonstrated as feasible for determination of trace levels of Hg2+ in drinking and environmental water samples.
129 citations
TL;DR: Catechol, hydroquinone and resorcinol were found to inhibit the CL signals of the luminol-NaIO4 reaction catalyzed by gold nanoparticles, which made it applicable for the determination of these polyphenols.
129 citations
TL;DR: In this paper, a simple and sensitive electrochemical method for the determination of atrazine using a square-wave voltammetry on boron-doped diamond electrode was developed.
Abstract: A novel, simple and sensitive electrochemical method for the determination of atrazine using a square-wave voltammetry on boron-doped diamond electrode was developed. Atrazine provided a single well-defined reduction peak at −1.1 V vs. Ag/AgCl electrode in Britton–Robinson buffer solution at pH 3. The effect of supporting electrolyte, pH and scan rate on the current response of atrazine was studied to select the optimum experimental conditions. The linear concentration range from 0.05 to 40 μM (R2 = 0.999, n = 6), the good repeatability (relative standard deviation of 2.9% at 10 μM for n = 6) and the detection limit of 10 nM were achieved at optimized square-wave voltammetric parameters (step potential of 5 mV, frequency of 60 Hz and amplitude of 80 mV). The influence of possible interfering agents appeared to be minor which evidently proved the good selectivity of method. The proposed method was successfully applied for the determination of atrazine in spiked river water samples with satisfactory recoveries (92 to 100%) and the good agreement to results obtained by reference high performance liquid chromatography method at confidence interval for 95% probability. In this way, boron-doped diamond could represent an environmentally acceptable (green) alternative to highly toxic mercury electrodes for monitoring of pesticides.
129 citations